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Member postings for Dickw

Here is a list of all the postings Dickw has made in our forums. Click on a thread name to jump to the thread.

Thread: Battery retention methods
19/10/2019 23:29:52

I use 6s 5000 packs in a Sebart Pitts. The battery is retained by two velcro straps - one round the middle of the battery and one round the length of the battery. No problems in several years of throwing it around in all directions.

Packs can be changed very quickly.


Thread: Rubber power problem
17/10/2019 11:05:08

"Will covering the fuselage privide any stiffness?"

Yes - the doped tissue covering is what provides most of the stiffness - the frame is just there to hold it in place.

Changing and replacing the rubber was normal, so installing the rubber before covering was never considered an option.


Thread: Motocalc or Ecalc?
17/10/2019 10:58:22

I use both DriveCalc and MotoCalc and have found both to be very useful and reasonably accurate at predicting performance - provided you put decent data in to start with!


Thread: Lipo advice please
07/10/2019 15:07:13

I use 10s packs regularly.

I buy 5s packs or 6s and 4s packs and solder them in series to make a 10 s pack. A 10 s pack is just 10 cells wired in series, so it doesn't really matter how you do that.

Where it does matter is in charging. If you want to charge a 10s pack you will need a 10s charger and there are relatively few on the market. If you use 2 x 5s packs plugged together, you can separate them and charge them on a more common 6s charger. I use 10s chargers.


Thread: Prop balance query
30/09/2019 23:35:12
Posted by Tom Sharp 2 on 30/09/2019 20:45:48:

Wot if it's a folder?

folding prop balancing.jpg

Thread: How To Make an Ultra Micro R/C Plane & Beat the New Rules !
23/09/2019 11:04:13

I have been flying an 89gm flying wing for a couple of years. It works OK in quite windy weather and is capable of most manoeuvres that don't need a rudder - loops, bunts, vertical eights, rolling circle (a bit untidy). At 89gms that leaves a lot of room for development.

The germans already have a class for sub 250gm racers and have developed fully moulded model for it with speeds over 150mph.

And some in the US are also doing similar.

Sub 250gm is just another challenge.


tiny bit.jpggerman sub 250.jpg

Thread: Flight restriction zones
31/08/2019 12:25:50

If you look in the "Documents" section of the on-line membership system there are two documents designed to help:-

Template Memorandum of Understanding ATC Permission

Flight Restriction Zone permission guidance


Thread: A Firefox bridge too far
25/08/2019 12:13:12
Posted by kenking-King Design on 24/08/2019 22:15:49:

................... Someone said recently that the grey veil manifests itself on some sites until one agrees to Cookies, but I can't see anything asking about cookies on the TalkTalk site, and it is just that site that is affected.

Maybe it isn't Firefox at fault at all,but wretched TalkTalk. They are now notorious for having problems, but being slow to confess.


Out of curiosity I just tried the TalkTalk site on a laptop with Windows10 and Firefox.

As soon as I went to the "News" page the grey veil came down and I was presented with a box asking me about accepting cookies. I chose the No option and the grey veil went away leaving me with a normal working site.

Looks like a Talk Talk issue rather than Firefox or windows.


Thread: Latest CAA Update
24/08/2019 14:52:58
Posted by Steve J on 24/08/2019 12:36:54:

Posted by Cuban8 on 24/08/2019 11:35:13:

or the significant increase in paperwork that you can bet your bottom dollar, as my club's membership sec, I'll be saddled with.

Why is there going to be more paperwork? The BMFA are saying that "Compliance will therefore be advisory rather than a condition of membership.".


That raises an interesting question.

If a club allows an unregistered operator/pilot to fly on its field and that person causes an accident, would the BMFA insurance cover claims against the club even if not against the operator/pilot.

I think there is a long way to go yet before all the issues around this are sorted out.


Thread: Single servo ailerons
15/08/2019 14:34:36
Posted by Nigel R on 15/08/2019 13:44:06:


Redundancy is a thing, but, do either of you fit two elevator servos as well? Elevator is just as much a critical control, possibly more so than ailerons.

Or dual rudder servos?

Or dual receivers?



On a recent build of a scale model kit designed for one elevator servo (split elevator with joiner), I actually fitted smaller dual elevator servos for redundancy. My personal history suggests electro-mechanical devices like servos are less reliable than pure electrical devices like receivers.

I have many models without a rudder, so feel no need for redundancy on rudder.

I don't think anyone is saying single servo setups are bad - just that dual aileron servos give more options if you want them.


15/08/2019 11:03:54
Posted by Martin Harris on 15/08/2019 10:24:57:

I think it depends on how interested you are in fine tuning a model for pleasant performance. ..................

There is the added advantage that should you get a servo failure, you have at least a fighting chance of landing the model in one piece -......................

...................- a clubmate experienced a similar situation and was very lucky (skillful, Dick?) to wrestle his model onto the ground with only covering damage from the heat generated by a short circuit in the servo electronics. ............... likely to have crashed due to lack of roll control!

I would obviously like to claim skill, but perhaps luck played a bigger part than I would like to admit to smiley.

I am firmly in the "2 servo" brigade on all the above mentioned grounds, and would like to add that with 2 servos you can operate the ailerons as flaps or as spoilers, and even couple the "flaps" with elevator like in my control line days. Elevator full up with flaps full down at speed can add a bit of fun and adrenalin into your life.


Edited By Dickw on 15/08/2019 11:04:31

Thread: Interesting reply from email to Richard Moriarty, CAA
02/08/2019 10:18:34
Posted by Philip Lewis 3 on 02/08/2019 00:39:13:
Posted by Martin Harris on 02/08/2019 00:24:23:

I think it most unlikely that the BMFA would register our models on our behalf and clubs will most probably take the same attitude even if the final legislation allows it.

I disagree, having read the draft legislation the legal responsibilities of the operator are not that onerous, prove any required test is passed, comply with any ANO, only fly where allowed legally to do so and ensure any laws are obeyed..

If I was out for the day, say 100 miles from home, and flying in a farmers field, how would the BMFA or my club be able to ensure I was only flying where legally allowed to do so and was obeying all relevant laws?

I am not against the idea, just trying to figure out how it would work..


Thread: Can you charge a LiPo through its balance lead?
01/08/2019 12:16:06
Posted by FilmBuff on 01/08/2019 11:26:11:

Thanks guys. I'm aware of the issues with in situ charging but I'm thinking a 0.5A - 1.0A charge through the balance lead would not be harmful?

I charge the 2s Lipo rx battery on some of my models in situ via the balance lead using an adapter lead to my regular charger (adapter - the main charge leads are connected to the outer conductors on the balancer plug). I only use this setup on 2s batteries because with the main charge current passing through the outers on the balance plug the balancing would be problematic for more than 2s. However with a charger designed for balance lead charging that shouldn't be a problem.

Provided you keep the current low and you are happy with the normal charging risks, what you propose should work.


Edited By Dickw on 01/08/2019 12:16:36

Edited By Dickw on 01/08/2019 12:16:55

Thread: Battery
25/07/2019 10:45:54
Posted by Cuban8 on 25/07/2019 10:14:12:

Can't say that I was overly impressed with a 'Leisure Battery' that I bought a few years ago for field charging. ...................................................................

On the solar panel idea - not convinced that a panel would keep a battery that well charged during a flying session, if that is what is being suggested. Even quite expensive ones are only able to deliver milliamps (tens or a few hundreds) when in full sunshine. Depends on what you have in terms of size and efficiency of course.

For an afternoon's flying with say four 1500 3S and a couple of 3000 6S, I haven't had any problem charging from my car battery, ...................................... Obviously not an option if you're going to a fly-in or similar for a few days though.

So far that is a fair number of us not impressed with Leisure batteries. I did find that I got on better with an ordinary car battery bought from Halfords - still heavy though hence my move to lithium which gave better performance for less weight.

Not sure what size solar panels you are referring to regarding your quoted performance figures but mine, shown in the photo above, always give me around an amp even on a dull cloudy day and 5 or 6 amps if the sun comes out. Last sunday they put 14.5 Ah into my battery during a day of mixed cloud and sun. The attached data log shows one of my initial tests with the panels last year - a typical dull cloudy day out with a total of about 7.5 Ah output. They certainly work for me, and if 7.5Ah doesn't sound much don't forget that is in addition to my 30Ah battery capacity.


20180818 f5b practice day notes.jpg

24/07/2019 17:25:54

There is the option of using solar panels to keep a small 12v battery topped up while charging.



24/07/2019 13:11:17

Going in a sightly different direction on 12v batteries - I also used Leisure batteries in 110 Ah or 80 Ah sizes for many years, but got fed up with having to replace them every couple of years.

About 7 years ago I invested in a 4s2p LifeP04 battery built myself using 15 Ah cells so giving me 12v 30 Ah. Because of the different discharge characteristics of the Life cells I found I got more out of them at the field than I ever did out of an 80 Ah Leisure battery, and they are still going strong unlike any of the Leisure batteries I used.

I got the cells, connectors, etc. from here. Not cheap initially, but they have saved me money in the long run.

The other advantage is they are a lot less weight, so the pack is built into my model box as per the photo.

charging batt.jpg


Thread: Who says flying thermal soarers is boring?
20/07/2019 12:44:39

The videos so far definitely show F5J thermal soarers.

If you want to see a hotliner have a look at a video of the first part of an F5B comp flight (the second part of the flight is basically a 10 minute thermal duration). F5B planes are basically high powered 2m soarers.

Some F5B videos here.


Thread: Electric Cars.
08/07/2019 10:01:36
Posted by Wingman on 07/07/2019 21:52:22:

It's the range thing that always bothers me about electric cars.

I recently drove 450 miles which took me about 8 hours where I stopped once for fuel, twice for 'comfort' and once for 30 minutes for lunch. I travelled at 80 mph where possible.

I was wondering if anybody on here has done a similar sort of distance in an electric vehicle and, if so, would they like to share their journey details so I can get some sort of idea how that sort of range is covered electrically.

Last weekend I was at an international model competition near Ashford in Kent. After the competition finished on Sunday morning a friend of mine, and one of the UK competitors, set out about lunch time to drive back to Scotland in his 100 mile range electric car. He got home Tuesday evening (yes, 2 overnight stops).

Approx 380 miles as the crow flies so probably around the 450 mile mark driven. I am sure he could have done it with just one overnight stop and longer days driving. I think he has a 2 hour charge time.


Thread: Advice please
02/07/2019 22:09:06

The BMFA Achievement Scheme website has some useful Quizzes to help you prepare for the question part of the A cert test.


Thread: Manual / instructions needed please
01/07/2019 17:53:16
Posted by SIMON CRAGG on 01/07/2019 11:37:45:


At the time, the instructions were included on a download tab.

I have just got round to installing the glowdriver , but the item has disappeared from the HK site.


Edited By SIMON CRAGG on 01/07/2019 11:39:36

Denis has shown most of it, but for the record the instructions do still seem to be available on the "Upload Files" tab on the HK site here.


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